on your main page..
put the two side by side... maybe people would see this

but first you should probably talk to them about it, because they might not have deliberately done it.. well, unless it's like more than 3... than I guess there's no talking required!!

On another site, some girl took my work and put songs over it... then put a copyright on it... I confronted her a long with a few other people and she deleted her account.

Report them. Also, you may try banning them from your page. I'm not sure how that works exactly, if it applies when they're not logged in or not.
Nonetheless, it's frustrating, I know. Hang in there!

Report the idiots.

hm...

If someone copz u..without permision...
u r better then he/she....
....u can report...but first talk... ÖS!

best!!

If this this person didn't respond to your warning, you must report him or her!!

Vorbeste cu ei/ele, daca au facut-o ca exercitiu atunci ar trebuie ca macar sa mentioneze lucrarea ta originala (si eventual sa ceara pareri comparate, nu de alta dar daca e exercitiu si vor sa invete atunci acest lucru le-ar fi de un real folos. Eventul ai putea sa le oferi indicatii care sa-si creeze propriile lucrari originale).

Un jurnal cu copii adunate si mentiunile de rigoare ar fi urmatoarea optiuni, macar fanii tai vor sti sa faca diferenta. Ai putea sa incerci sa-ti postezi lucrarile cu licente Creative Commons mai restrictive atasate, care sa interzica copierea si atunci daca respectivii insista si se leaga de lucrari protejate, ar putea fi cel putin dati afara de pe dA.

Optiuni sunt mai multe si stiu ca e chiar dureros cand lumea reproduce lucrari ale tale care in mod sigur au in primul rand o valoare emotionala. Dar fanii sunt alaturi de tine si in final, raul facut se intoarce impotriva faptasului.

Unfortunately, this apparently has been happening a lot, and it's easily done and apparently easy to get away with. Since it's not technically the same work, you probably won't be able to find any help getting it removed. Fortunately, people here on dA are smart and will be able to tell the works this person is producing are blatantly copied from yours. I would hope they wouldn't give this person the attention by favoriting the copied pieces and adding to the person's page view count.

I'm sorry you're going through this. You're an amazing person, and I hate to see you hurt in this way. Try to take some comfort in knowing there are a lot of people here who support you and respect your art.